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An important concept in Virtual Reality (VR) is that of presence; the subjective perception that a mediated experience seems very much like it is not mediated. Many authors have assumed a strong relation between presence and the level of interactivity, and this article will look into this assumption. Several variables of interactivity show a clear relation to presence, but others are more complex. Knowing which elements of a Virtual Environment (VE) can attribute to presence is necessary for some applications such as treatment of phobia, necessitating further research into this area.